Gerris is an Open Source Free Software library for the solution of the partial differential equations describing fluid flow. The source code is available free of charge under the Free Software GPL license.

Gerris is supported by NIWA (National Institute of Water and Atmospheric research) and by the Marsden Fund of the Royal Society of New Zealand.

The code is written entirely in C and uses both the GLib Library and the GTS Library for geometrical functions and object-oriented programming.

A brief summary of its main (current) features:

The same code base is compiled with 2D and 3D support.

Quadtree-based (Octree in 3D) spatial discretisation with automatic and dynamic local refinement.

If you are interested in Gerris, feel free to join the gfs-announce mailing list, a low-traffic list which will keep you up-to-date with the recent developments in Gerris. If you intend to use Gerris and have any technical question please consider sending a post to the gfs-users or gfs-devel mailing lists.